With Miscellaneous Reagents

Diphenyl tellurium kept in hexatritiobenzene in the presence of potassium tetrafluorobo-rate or perchlorate yielded diphenyl hexatritiophenyl telluronium salts in 63% yield. 

Zhuravlev (Penn State Univ. Leningrad State Univ.), 1982 C.A. 97, 127270 (1982). 

Bis[pentafluorophenyl] tellurium and pentafluorophenyl xenon fluorotris[pentafluorophe-nyl]borate reacted in acetonitrile to give the tris[pentafluorophenyl] telluronium salt  

Dimethyl tellurium in liquid hydrogen fluoride at — 70° was saturated with boron trifluoride. The dimethyl telluronium tetrafluoroborate was detected by and Te-NMR spectroscopy.  

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Reduction of aldehydes to alcohols with miscellaneous reagents. 83-84... 

Alcohols from ketones by reduction with miscellaneous reagents. 116-118 Baeyer-Villiger degradation of ketones to alcohols and phenols. . . 118... 

Miscellaneous Ketone Reductions. The reductive allylation of aromatic ketones occurs with the reagent combination of Me2ClSiH/allyltrimethylsilane/ InCl3 (Eq. 253).427... 

Part I deals with chapter involving typical complex organic reactions. Part II deals with various aspects of spectroscopy and the use of this technique in identification of compounds. Miscellaneous reagents used in organic synthesis are discussed in Part III. 

Propargyl alcohols may be converted to allenes by several methods, for example, (a) through the intermediate formation of propargyl halides which are not isolated but react directly with cuprous salts and hydrogen halide [60, 72-73] or cyanide [71] (b) typical alcohol reactions with thionyl chloride [74a-d] phosphorus halides [75-77], and miscellaneous reagents (see Scheme 3). 

Miscellaneous reactions of four-carbon units with sulfurizing reagents 890... 

Activation of Acids with Miscellaneous Coupling Reagents... 

Some miscellaneous methods which may grow in importance deserve a brief review. The potential use of photogenerated reagents in experiments where time-dependent phenomena are examined was mentioned in Chapter 1. Many methods for investigating rapid events in biological systems, such as the use of fluorescent probes, yield little structural information. Examples of experiments with photoactivatable reagents that do yield such information have appeared recently. They include the use of a hydrophobic reagent to monitor the interaction of cholera toxin with membranes... 

Acetoxylation. Transformations of Carbonyl Compounds. Phenolic Oxidation. Oxidation of Nitrogen Compounds. Hypervalent iodine Reagents in Combination with Azido Compounds. DIB and Sodium Azide in Combination with Other Reagents. Transformations of Alkynes Involving Thiophenols and Diphenyl Diselenide. Miscellaneous Reactions. 

Miscellaneous. Reagent prepared by the Syntex procedure has been used to oxidize pyridine methanols to the corresponding aldehydes, mercaptans to disulfides, aliphatic a-ketols to a-diketones, and N-phenylhydroxylamine to nitrosobenzene. A suspension of the dioxide in an ethereal solution of the substrate was stirred vigorously for 5-6 hrs. and the oxide was removed, and washed with ether. The filtrate and washings were concentrated under reduced pressure and the product isolated by distillation or crystallization. 

By reaction with alkyl halides, esters of sulfonic and carbonic acids, trimethy-loxonium tetrafluoroborate, diazo compounds, Mannich or Mitsunobu conditions or miscellaneous reagents. Methyl iodide is a versatile and effective methylating reagent that can be used at room temperature, at moderate temperatures in a tightly closed vessel or at high temperatures in an autoclave. 2,4-Dihydropyrazol-3-one 1 was methylated at N1 with sodium hydride in boiling 1,4-dioxane followed by methyl iodide at room temperature. l,2-Dihydropyrazol-3-one 2 was obtained in 59% yield (79AP853) (Scheme 1). 

Miscellaneous Reactions.—Trity fluoroborate. previously reported as cleaving acetals by hydride abstraction, also cleaves benzylic ethers and a variety of related species, giving benzaldehydes. " Cholesteryl benzyl ethers afford cholesterol. The bismethylenedioxy protecting group for the corticosteroid side-chain is also cleaved with this reagent. 

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